The Bushing,sleeve, cataloged under National Stock Number 3120-01-231-4530, is classified within Federal Supply Class 3120 (Bearings, Plain, Unmounted) of the Bearings group. The manufacturer of record is Timken Gears & Services Inc. Div Philadelphia Gear. Government technical data includes 22 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3120-01-231-4530 |
| Primary Part Number | 439B903-001 |
| Item Name | Bushing,sleeve |
| FSC / FSG | 3120 / 31 — Bearings, Plain, Unmounted |
| Manufacturer | Timken Gears & Services Inc. Div Philadelphia Gear |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY |
| Surface Finish | 32.0 MICROINCHES INSIDE DIAMETER SURFACE OF BODY |
| Surface Finish | 63.0 MICROINCHES LEFT END SURFACE OF FLANGE |
| Corner Shape | ROUND CENTER FLANGE RIGHT BODY CORNER |
| Corner Shape | SQUARE OUTSIDE RIGHT CORNER |
| Corner Shape | SQUARE CENTER FLANGE OUTSIDE LEFT CORNER |
| Corner Shape | ROUND INSIDE LEFT CORNER |
| Corner Shape | CHAMFERED OUTSIDE LEFT CORNER |
| Corner Shape | ROUND INSIDE RIGHT CORNER |
| Corner Shape | CHAMFERED CENTER FLANGE OUTSIDE RIGHT CORNER |
| Corner Shape | UNDERCUT CENTER FLANGE LEFT BODY CORNER |
| Left End Body Diameter | 2.1245 INCHES MINIMUM AND 2.1250 INCHES MAXIMUM IN |
| Flange Outside Diameter | 2.6200 INCHES NOMINAL IN |
| End to Flange Distance | 2.0000 INCHES NOMINAL IN |
| Style Designator | SOLID, EXTERNAL FLANGE |
| Material Document and Classification | MIL-S-869,CL A,COND 2 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 0.9990 INCHES MINIMUM AND 1.0000 INCHES MAXIMUM IN |
| Lubricant Accommodation Style | GROOVED CIRCULAR |
| Right End Body Diameter | 2.0000 INCHES NOMINAL IN |
| Flange Width | 0.5000 INCHES NOMINAL IN |
| Material | STEEL COMP 135M OVERALL |
| Surface Groove Location and Quantity | 1 EXTERNAL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 439B903-001 PRIMARY | Timken Gears & Services Inc. Div Philadelphia Gear (USA) |
| PL-577E907 PIECE 43 | Timken Gears & Services Inc. Div Philadelphia Gear (USA) |
| Reference | Meaning |
|---|---|
| 439B903-001 | 5/9 Secondary reference General Electric Company |
| 439B903 | 5/9 Secondary reference General Electric Company |
| PL-577E907 PIECE 43 | 5/9 Secondary reference General Electric Company |
NSN 3120-01-231-4530 is a Bushing,sleeve, manufactured by Timken Gears & Services Inc. Div Philadelphia Gear, classified under FSC 3120, Bearings, Plain, Unmounted. Status: active.
NSN 3120-01-231-4530 has 2 manufacturer part numbers on file: 439B903-001 (Timken Gears & Services Inc. Div Philadelphia Gear), PL-577E907 PIECE 43 (Timken Gears & Services Inc. Div Philadelphia Gear).
Key specifications for 439B903-001: Surface Finish: 63.0 MICROINCHES OUTSIDE DIAMETER SURFACE OF BODY; Surface Finish: 32.0 MICROINCHES INSIDE DIAMETER SURFACE OF BODY; Surface Finish: 63.0 MICROINCHES LEFT END SURFACE OF FLANGE; Corner Shape: ROUND CENTER FLANGE RIGHT BODY CORNER. 22 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.